Machine Design
The objective of idler pulley in belt drive is to

All the above objectives
Decrease the tendency of belt to slip
Increase the power transmission capacity
Increase the wrap angle and belt tension

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Machine Design
Coaxing is the procedure of increasing

Metal hardness by surface treatment
Fatigue limit by over-stressing the metal by successively increasing loadings
Metal resistance to corrosion by coating
Metal strength by cycling

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